Head-motion for ore-concentrating tables.



No. 734,758. PATENTED JULY 28, 1903.

I L. SHARING.

HEAD MOTION FOR ORE GO'NG-ENTRATING TABLES.

APPLIOATION FILED MAR. 19, 1901. N0 MODEL. 2 SHEETS-SHEET 1- PATHNTEDJULY 28, 1903..

APPLICATION FILED MAR. 19, 1901.

2 SHEETS-SHEET 2.

H0 MODEL.

filhewses;

fa /e71,

. ditions it is of course the equivalent.

UNITED STAT S: PATENT Patented Ju1y28,1903.

OFFICE.

LEWIS SEARING, OF DENVER, COLORADO.

HEAD -MOTION 'FOR ORE-CONCENTRATING TABLES.

SPECIFICATION forming part of Letters Patent No. 734,758, dated July 28,1903.

Application filed March 19; 190i. Serial No. 51,869. (No model.) 7

To all whom it may concern/.- M

Be it known that I, LEWIS SEARING, of Denver, in the county of Arapahoeand State of- Colorado, have invented certain new and use-- In thedrawings, Figure 1 is a side elevation of one form of the head-motion asapplied to i one form of concentrating-table, some parts of the tablebeing omitted. Fig. 2 is a perspective View of the head-motion detachedfrom the table. Fig. 3 is another perspective View of the same as seenfrom the farther side I Fig. is an explanatory diagram of Fig. 2. z 5consisting of six parts, A, B, C, D, E, and F.

Fig. 5 shows the curves produced by sucha motion when traced on a movingsurface analogous to the manner of taking an indicatorcard of asteam-engine. Fig. 6 shows another 0 and less preferred form of thehead-motion.

This improved head-motion primarilyconsists of a peculiar rocking shoeor buttonb,

which rocks against a cooperating surface movable withthe table. I findthat it is a far better construction to have aplane surface on the partthat moves with the table and have a curved surface for the button orshoe upon the rocking member; but so far as the reverse construction maybe used under proper con- The rocking button or shoe b is carried upon ashort arm and actuated by a rock-shaft d in the preferred constructionshown in Figs. 1, 2, and 3. Thebutton or shoe b is secured upon 4.5 arockerhead e on one end of the shaft (1.

The sh aft (1 is mounted in suitable fixed bearingsf and carries at itsother end a crankarm g. The arm 9 is actuated by a link h and crank j.The crank j is carried by the rotary ,50 shaft is, which is driven bycone-pulleys Z, as

-ilh strated. The curved wearing-surface of the rocking shoe or button bis designed to produce thepeculiar end-shake motion required for thetable. The design of the curve may besuch as to produce a much more sudden reversal of movement at one end of the stroke of the table than atthe other end, or, on the other hand, it may be so designed (as will bewell understood by engineers) that the .difierence is not very great;but with any given design the length of stroke may be greatly changed byadjusting the position of the shoe or button upon the rocker-head'e.Preferably the button or shoe is detachably bolted to a plane surfaceupon the rockerhead 6, as shown in the figures, and by loosening thebolt it may be adjusted upon the said surface toward or away from thecenter of the rock-shaft d.

Fig. 4 shows the action of the shoe or button 11 against the planesurface of the buffer 19 at the end of the table. For convenience inexplaining the action of the rocker button or its rocking movement is ator near its upper right-hand corner, as seen in Fig. 4. As suming forthe purpose of explanation that the rock shaft turns at an even speedthroughout the forward vibration of the but 'ton b,-it is clear that thespeed which the motion of the rook-shaft and button gives to thedistance at each instant between the center of button touches thebuffer. In other words, the point of contact between the buifer and theshoe shifts along the surface of the buffer, or transversely to thedirection of the movement of the parts during reciprocation. Thus indiagram a, Fig. 4, a small movement of the button produces a very slightmovement of the buffer-surface p. In diagrams b and c the resultingmovement is rap idly increasing. In diagram at or c it reaches itsmaximum, because the button now bears against the surface of the buffer19 at a-very considerable distance from the centerof the rocking motion.By raising the "button or shoe 1) by adjusting it on the head 6 themotion produced by it upon the buifer 19 will be modified, and thedifference between the two ends of the stroke will be'decreased.

shoe 1) it may be supposed that the center of buffer 0 will "beproportional to the vertical motion and the point of contact, where thewhat similarly to harmonic motion.

, or shoe b.'

Owing to the Way the rock-shaft d is driven, its own vibratory motion isgradually retarded and reversed at each end of the stroke, some- I makeno point of this as an essential of the invention, because I contemplateactuating the button b by various different meanssuch, for instance, asthose shown in Fig. 6, which will be presently described.

Fig. 5 illustrates two different curves,whicl1 represent the motion ofthe table-top and which may be actually produced on paper by a pencilsecured to the table-top and by then drawing a piece of papertransversely while the table-top moves the pencil over the paper. Theheavy curve in Fig. 5 shows a very quick reversal at the outer end ofthe stroke, which is indicated by the sharper points of the curve at thebottom of the figure, while the light -line curve shows a minimum ofquick reversal at the outer end of the stroke. Indeed, this curve is aclose approximation to a sinusoidal curve.

Other things being equal, the more convex the button I) the less will bethe difference between the two ends of-the stroke, because the less willbe the point of contact between the button and the buffer travel up anddown. Where the curvature of the button is very sharp, the adjustmentupon the rocker-head e is of great value and importance, but theadjustability may be omitted. When the button is fixed upon the head ein the relative position shown in Fig. 1, it will be seen that thecurved face of the button passes directly through the axial. line(prolonged) of the shaft d. This has obvious advantages, but it is by nomeans essential.

In Fig. 6 the rocker-button b is shown actuated by a different mechanismfrom that already described. It rocks about the pivotal point (1, butinstead of a separate crank g, described above, the link It bearsdirectly against the rocker-arm or rocker-head e. The link is driven, asbefore, by a short crank '70 on the shaft and this shaft 70 may eitherbe rotated continuously or rocked to and fro by any suitable mechanism.Indeed, the means for rocking or vibrating the button or shoe 1) arevery numerous. I will not attempt to describe or enumerate them. In theform shown in Fig. 6 lost motion at the two ends of the link it isprevented by the constant thrust of the table and buffer 9 in thedirection indicated by the arrow. Such a constant thrust may be producedby the table-spring s, Fig. 1, which also serves to keep the buffer 19in contact with the button I sisting of a curved reciprocating shoe forvarying the relative motion of the actuated part and the shoe'byshifting'the point of contact between the shoe and the actuated partalong the surface of said actuated part during reciprocation, and meansare also provided for adjusting the shoe to vary its path of travel.

My apparatus is in reality a simple means for "arying the inertia at thetwo ends of the stroke, and in order to accomplish this end themechanism is so constructed that the curved surface of the actuatingbody or shoe makes contact with the part to be actuated at increaseddistances from the center of the motion of the shoe as measuredperpendicular to the travel of the actuated part, or buffer,

as the shoe or actuating means approaches one end of its stroke, wherebythe ratio of the speed of the buffer to the speed of the actuating-shoeis greater at that end of the stroke than at the other.

What I claim, and desire to secure as the novel and characteristicfeatures of my invention, are the following:

1. In a head-motion for ore-concentrators, the combination of a part tobe actuated, and variable-speed actuating means consisting of acurvedreciprocating shoe for varying in one direction of movement of theactuated part and at a speed gradually increasing throughout saidmovement the relative motion of the shoe and the part to be actuated, byshifting the point of contact between the two along the surface of thepart to be actuated during reciprocation, substantially as and for thepurposes set forth.

2. In a head-motion for ore-concentrators, the combination of a part tobe actuated, and variable-speed actuating means consisting of a curvedreciprocating shoe for varying the relative motion of the shoe and thepart to be actuated, by shifting the point of contact between'the twoalong the surface of the part to be actuated during reciprocation, andmeans for adjusting said actuating mechanism to vary the path of travelof the shoe, substantially as and for the purposes set forth.

3. In a head-motion for ore-concentrators, and in combination forsubstantially the purposes set forth, as a simple means for varying theinertia at the two ends of the stroke, a part to be actuated, acooperating curved actuating part or shoe mounted for vibratory motion,the curved surface of the actuating body or shoe being ofgradually-increased radius from one end of its wear-surface to the othermakes contact with the part to be actuated at increased distances fromits center of motion as measured perpendicular to the travel of the partto be actuated as the parts approach one end of the stroke, and meansfor vibrating said shoe whereby the ratio of the speed of the part to beactuated to the speed of said actuating-shoe is greater at said end ofthe stroke than at the other.

4. In a head-motion for ore-concentrators, and in combination forsubstantially the purposes set forth, as a simple means for varying theinertia at the two ends of the stroke, a

part to be actuated, a cooperating curved actuating part or shoemounted-for vibratory motion, the curved surface of the actuating bodyor shoe making contact with the part to be actuated at increaseddistances from its center of motion as measured perpendicular to thetravel of the part to be actuated as the parts approach one end of thestroke, means for vibrating said shoe whereby the ratio of the speed ofthe part to be actuated to the speed of saidactuating-shoe is greater atsaid end of the stroke than at the other, and means for adjusting saidshoe, to alter its path of travel.

5. In a head-motion for ore-concentrators, the combinationof apivotally-supported but- LEWVIS SEARING.

Witnesses:

FRANK E. SHEPARD, EDWIN I-I. PLATT.

